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XRP Ledger Developers Defend Emergency Patch for Unlimited Token Bug

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XRPUSD$1.40 −0.37%

XRP Ledger developers issued an emergency security patch on Sept. 25 to fix a long-standing vulnerability that could have allowed attackers to generate XRP (BITSTAMP:XRPUSD) beyond the network's fixed supply limit. Developers bypassed the network's standard two-week validator vote to deploy the fix three days after receiving a bug bounty report, marking the first deliberate bypass of the standard amendment process in over ten years.

The vulnerability stemmed from an integer overflow bug in the payment engine that had been present since 2015. If exploited through complex, multi-offer payments, the flaw would have charged buyers a tiny wrapped sum while crediting seller accounts with newly created, spendable tokens. Developers confirmed that no evidence shows the flaw was ever exploited on public networks. However, bypassing the voting process sparked debate among industry observers regarding the blockchain's degree of decentralization.

Network contributors defended the emergency action, stating that exposing the vulnerability during a public two-week vote would have created major security risks. They noted that permanent protocol changes still require more than 80% validator approval over two weeks. Following the update, XRP was trading down 0.20% at 1.406 USD.

Key points

  • XRP Ledger developers released an emergency patch on Sept. 25 to fix a flaw that allowed creation of XRP beyond the fixed supply limit.
  • Developers bypassed the standard two-week validator vote to prevent potential attackers from discovering and exploiting the bug.
  • The vulnerability was caused by a 2015 integer overflow bug in the payment engine, but developers found no evidence of public exploitation.
  • Bypassing the voting process raised questions about decentralization, though developers noted permanent amendments still require 80% validator support.

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Questions and answers

What was the bug in the XRP Ledger?

The bug was a 2015 integer overflow flaw in the payment engine that could have allowed an attacker to create XRP beyond the fixed total supply through specially crafted offers.

Why did XRP Ledger developers skip the validator vote?

Developers skipped the standard two-week vote because publicizing the flaw before a patch took effect would have exposed the network to potential security exploits by attackers.

Was any XRP improperly created using the bug?

Developers reported finding no evidence that the vulnerability was ever exploited on any public network prior to the emergency fix.